#include<stdio.h>
my_strcat(char* dest, const char* src) {
	while (*dest) dest++;
	while (*dest++ = *src++);
}
/*int main() {
	char arr[20] = "hello ";
	char* p = "world";
	my_strcat(arr, p);
	printf("%s\n", arr);
	return 0;
}*/